MTL-303-12

3-flute extra-length Tuffy grade square end mills — long flutes for deep side milling, with shank flats on the larger inch sizes.

• 3 flute square end extra-length Tuffy grade carbide with 30° helix
• Long flute lengths for deep walls — up to 3" of flute on the 3/4" tool (5" OAL); metric MTL runs up to 75 mm flute on the 20 mm tool (130 mm OAL)
• Inch sizes 1/8"–3/4" (TL-303); metric sizes 3–20 mm (MTL-303)
• Shank flats on the 3/8", 1/2", 5/8", and 3/4" inch sizes for secure holding; 1/8"–5/16" and 7/16" sizes and all metric tools do not have flats
• Rated for side milling, semi-finishing, and finishing — wet, cold air, or spray mist
• Broad material range: aluminum, copper, magnesium, cast iron, steel, stainless steel, plastics, brass, and wood
• Tolerances: cutting dia −.001/−.002 at 1/8" and +.001/−.000 from 3/16"–3/4"; shank −.0001/−.0002; flute length +.060/−.000 (MTL cutting dia +.025/−.000 mm from 4–20 mm)
• Guide cross-reference for chatter on long reaches: consider the FM Series or add Mirror Edge treatment

From the RobbJack Applications Guide.